Place potatoes in a pot and cover with water. Bring to a boil, salt the potatoes and cook until tender, 10 to 12 minutes. Drain potatoes and add them back to the hot pot. Smash the potatoes with a masher to desired consistency with the cream and wasabi. Adjust salt, to taste.

While potatoes and meat cook, finely chop the scallions together with cilantro and lime zest.

Let meat rest 5 minutes then thinly slice on an angle against the grain. Serve meat on mash potato mounds with a garnish with a generous sprinkling of the chopped scallion-cilantro-lime zest.